Replacing The Heua; Figure 4-1 Position Of The Heua - Huawei BBU3900 Hardware Maintenance Manual

4 Replacing the Components in the OMB

4.1 Replacing the HEUA

The HEUA monitors the heat exchanger. The HEUA provides power to the FAN unit, monitors
the status of the FAN unit, and collects the alarm information about the cabinet and reports the
alarm to the main control unit.
Prerequisite
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Context
Figure 4-1

Figure 4-1 Position of the HEUA

HEUA
Procedure
Step 1 Wear an ESD wrist strap or a pair of ESD gloves.
4-2
The tools and materials, such as an ESD wrist strap or ESD gloves and M6 screwdriver,
are ready.
The quantity and type of board to be replaced are confirmed, and the new board is ready.
The authorized personnel are permitted to enter the site. The required keys are available.
shows the position of the HEUA in the OMB.
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BBU3900
Hardware Maintenance Guide
Issue 03 (2010-06-05)